KoboldTouch
An easier/better way to use Cocos2D for 2D game development.
Mobile Game Dev Videos
8+ hours of video tutorials - see how to make games with Corona SDK!
OGT Level Manager
Lock and unlock levels easily with OGT Level Manager for Corona SDK.
App Vault
Biz app developers - these help you create stunning apps in half the time while saving you tons of money you would have otherwise spent hiring designers.
Super Sprite Bundle
Royalty-free graphics for 2D games - animated characters, tile sets, etc.